\begin{table}[!htb]\centering                  \def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}                   \caption{Resurfacing and IRI \label{tab:IRI_resurfacing}}                 \setlength{\tabcolsep}{6pt}                                  \begin{tabular}{l*{7}{c}}\hline\hline
                &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         &\multicolumn{1}{c}{(5)}         &\multicolumn{1}{c}{(6)}         \\
\hline
$ \mathds{1}_{ist}(q) $          &   -32.66\sym{***}&   -31.94\sym{***}&   -34.18\sym{***}&   -39.33\sym{***}&   -39.31\sym{***}&   -43.28\sym{***}\\
                &   (2.02)         &   (1.97)         &   (2.20)         &   (4.57)         &   (4.55)         &   (5.24)         \\
$ t $           &                  &                  &                  &    -0.05         &    -0.04         &    -0.02         \\
                &                  &                  &                  &   (0.07)         &   (0.07)         &   (0.08)         \\
$ \mathds{1}_{ist}(q) $ $\times$ $ t $&                  &                  &                  &     0.69\sym{+}  &     0.67         &     0.83\sym{+}  \\
                &                  &                  &                  &   (0.41)         &   (0.41)         &   (0.47)         \\
\cline{2-7}State FE        &       No         &       No         &       No         &       No         &      Yes         &       No         \\
State-Year FE   &       No         &      Yes         &      Yes         &       No         &       No         &       No         \\
Segment id FE   &       No         &       No         &      Yes         &       No         &       No         &      Yes         \\
\hline
N               &  186,055         &  186,054         &  181,235         &  186,055         &  186,055         &  181,236         \\
\hline\hline                 \multicolumn{7}{l}{\footnotesize Standard Errors in Parentheses Clustered at the State-Year Level. }\\                         \multicolumn{7}{l}{\footnotesize  \sym{+} \(p<0.10\), \sym{*} \(p<0.05\), \sym{**} \(p<0.01\), \sym{***} \(p<0.001\). }                 \end{tabular}\end{table}
